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Finding the Fourth Proportional to 515,136.78, 710,961.35 and 285,745.05

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Solution

The fourth proportional to 515,136.78, 710,961.35 and 285,745.05 is: 394,368.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,136.78 : 710,961.35 = 285,745.05 : x
  2. Step 2: Convert to fraction form
    515,136.78/710,961.35 = 285,745.05/x
  3. Step 3: Cross multiply
    515,136.78x = 710,961.35 × 285,745.05
  4. Step 4: Simplify right side
    515,136.78x = 203,153,685,075.09
  5. Step 5: Solve for x
    x = 203,153,685,075.09/515,136.78
  6. Step 6: Final answer
    x = 394,368.43

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.